<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="/calc">
        <div style="margin-top: 100px;text-align: center;">
            <h1>计算器</h1>
            数字1：<input name="num1"><br>
            数字2：<input name="num2"><br>
            <input value="提交" type="submit">
        </div>
    </form>
    
</body>
</html>